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Man charged isn't 1974 cold case killer

A man charged in connection with three unsolved Brisbane murders from 1974 isn't the killer, police say.

Barbara McCulkin, 34, and her daughters Vicki Maree, 13, and Barbara Leanne, 11, were last seen at their Highgate Hill home on January 16, 1974 and have never been found.

A 66-year-old man has been charged with drug trafficking offences, following a raid at a rural property at Warwick, in Queensland's Southern Downs, on Wednesday, which netted $300,000 in cash and 50kg in cannabis.

The cannabis was found inside large drums and the cash was found inside the house in plastic shopping bags, police say.

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Detective Superintendent Steve Holahan says while the man charged over the illegal stash is of interest in relation to the McCulkins, he's not believed to be connected to the triple murder.

"At this point in time, we don't believe he's linked to the murders, but he is linked to the broader criminal network," he told Fairfax Radio on Thursday.